Kinetin and triacontanol effects on leaf characteristics, nitrate reductase activity, nodulation and yield in soybean Glycine max (L.) Merrill under reduced light intensity.

摘要

Kinetin and triacontanol effects on leaf characteristics, nitrate reductase activity (NRA) nodulation and yield in soyabean cv. Punjab Soyabean No. 1 were studied under reduced light intensity in Ludhiana, Punjab, India. There were 13 treatments, consisting of a control (full radiations throughout growth period; T1); 50% reduction in light at nodule initiation for 15 days followed by normal radiation until harvest (T2); normal radiation until flowering followed by 50% solar input throughout pod development (T3); T1+2 foliar sprays of kinetin (10 ppm) at the mentioned growth stages (T4); foliar spray of kinetin (10 ppm) at nodule initiation+normal light (T5); foliar spray of kinetin (10 ppm) at flowering+normal light (T6); T2+kinetin (10 ppm) (T7); T3+kinetin (10 ppm) (T8); T1+2 foliar sprays of triancontanol (1 ppm) at 2 growth stages (T9); foliar spray of triancontanol (1 ppm) at nodule initiation+normal light (T10); foliar spray of triancontanol (1 ppm) at flowering+normal light (T11); T2+triacontanol (1 ppm) (T12); and T3+triancontanol (1 ppm) (T13). A decrease in leaf area, number and fresh weight of nodules and NRA was recorded under reduced light intensity under both stages, which resulted in decrease in yield. The spray of kinetin and triacontanol at reduced light intensity recorded an increase in leaf area, number and fresh weight of nodules, NRA, chlorophyll and yield over the control. However, the efficacy of kinetin was more pronounced compared to that of triacontanol..